A belief is a direct leap from the unknown into being certain. A belief is always considered justified, otherwise why take it? An unjustified belief is seen as something other people have. It could be based on their faulty perception and misunderstandings or their sheeplike gullibility. But no belief is based on facts, otherwise it wouldn’t be a belief.
Uncertainty is the best you are ever going to get about most things, other than proven facts, and even then you are going to have to decide upon the viability of the source of your information. Equipped with your massive grab-bag of uncertainties you will still have to decide what to do.
But there’s good news. Uncertainty is the great creative space, the endless vistas of possibility. There is room in uncertainty for everything and a chance for almost anything. No matter how long you wait or study, the chances are you’ll never know for sure, although it pays to educate yourself as best you can. Knowledge is valuable. Certainty meanwhile is a form of death, admitting no possibilities but one (one which is in doubt, otherwise you wouldn’t have had to believe in it in the first place).